tc: updated ife man page.

Explain when skbmark encoding may fail.

Signed-off-by: Roman Mashak <mrv@mojatatu.com>

diff --git a/man/man8/tc-ife.8 b/man/man8/tc-ife.8
index a8f1f287d1502c2e768a262d7543a7c57b3627c9..1499a3fc5b80ef59abd04359fed922b880c57288 100644 (file)
--- a/man/man8/tc-ife.8
+++ b/man/man8/tc-ife.8
@@ -59,7 +59,10 @@ Encode direction only. Enforce static encoding of specified metadata.
 .BR mark " [ "
 .IR u32_value " ]"
 The value to set for the skb mark. The u32 value is required only when
-.BR use " is specified."
+.BR use " is specified. If
+.BR mark " value is zero, it will not be encoded, instead
+"overlimits" statistics increment and
+.BR CONTROL " action is taken.
 .TP
 .BR prio " [ "
 .IR u32_value " ]"